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ToDoubleD t1_j19fxl1 wrote

Possible stupid question here - can you shut off your water main if you have a boiler and still have it provide heat (if/when the electricity kicks back on)? I guess I've always heard the heating element is a closed system, but never thought about it if it pulls in water.

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TheDudeMaintains t1_j1asm3e wrote

There should be a make-up water supply line from your domestic water source to the boiler. Most of the time, the valve on that line stays open and the water level in the system self regulates to stay within its pressure parameters. Eventually, you'll lose some water out of the system and it will need a little make-up water.

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